HONOR MOTHER AT THE SAME TIME. ON STAGE WITH CARRIE UNDERWOOD. >> I HAD NO NERVES, WHICH WAS WEIRD. >> THE 20-YEAR-OLD SAID SHE WAS FOCUSED AND NOT ON THAT THOUSANDS OF THE CROWD, BUT ON UNDERWOOD AND HER MOTHER. AND THE REASON IS HERE. SHE SUBMITTED THIS VIDEO OF HERSELF PERFORMING PORTIONS OF UNDERWOOD SONG THAT CHAMPION TO WHEN THE CHANCE TO PERFORM THE SONG AT THE SHOW. UNDER WHAT IS OFFERING THIS OPPORTUNITY IN EVERY CITY WHERE SHE IS PERFORMING, BUT SINGING IS ONLY PART OF THE CONTEST. UNDERWOOD WANTS TO HEAR ABOUT THE SINGERS CHAMPION. THAT WAS EASY. >> IMMEDIATELY I THOUGHT MY MOM AND I SAID I HAD TO SING FOR HER. >> HER MOTHER HAS BATTLED MULTIPLE SCLEROSIS FOR 30 YEARS OF THE TWO OF THEM ALREADY HAD TICKETS TO THE SHOW TOGETHER. WHEN SHE GOT THE CALL SHE WAS GOING TO PERFORM, HER FIRST CALL WAS TO MOM. SHE DID, NO OR HER SO, NO PREP. SHE SAID SHE WAS TAKEN UNDER THE STAGE A FEW SONGS BEFORE SHE WOULD THING. SHE SAID SHE WENT INTO MAKEUP AND THEN WAS LIFTED UP ONTO THE STAGE. >> I LOOK TO MY LEFT AND I THOUGHT KERRY. THAT WAS THE ONLY PERSON I SAW IN THAT MOMENT. IT WAS REALLY FUN. >> SHE IS NOW HEADED BACK TO YOUNGSTOWN STATE WAS SHE IS STUDYING BUSINESS.

Four days before the Carrie Underwood concert in Pittsburgh, Molly Papp found out that she would be performing, too."I had no nerves, which was weird," said Papp. "I think I was so full of adrenaline that I was like, 'We got this. Let's do it, let's rock out,' and it was just so much fun."Watch the performance and our interview with Molly in the video player above.Papp was chosen after she submitted a video of herself singing Underwood's "The Champion." Underwood is selecting someone in each city on her tour to sing a portion of the song with her on stage.Singing is just a part of the contest. Each applicant has to write about the person they consider their champion. For Papp, that was easy. "Immediately, I thought, 'my mom,' and I have to sing for her," said Papp.Papp's mother, Joan, has battled multiple sclerosis for 30 years. "She has never let it break her down," said Papp. "She's just such an inspiration to me, so I figured: What better way to do this than for her?"Molly Papp and Carrie Underwood sing "The Champion" at PPG Paints Arena: Watch the video below!Papp said she and her mother already had tickets to the concert Saturday night, so when she found out she would sing, she said they went shopping and then prayed.A few songs before she was to perform with Underwood, Papp said she was whisked under the stage, put into makeup and soon lifted onto the stage to sing."I looked to my left and I saw Carrie, and that, was, like the only person I saw in that moment, and I was like, 'OK, we're just singing to each other,' so that was good and it was, really fun," said Papp.Papp is studying for a business degree, but she said that, after her experience Saturday, she hopes to continue singing, as well.

PITTSBURGH —

Four days before the Carrie Underwood concert in Pittsburgh, Molly Papp found out that she would be performing, too.

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"I had no nerves, which was weird," said Papp. "I think I was so full of adrenaline that I was like, 'We got this. Let's do it, let's rock out,' and it was just so much fun."

Watch the performance and our interview with Molly in the video player above.

Papp was chosen after she submitted a video of herself singing Underwood's "The Champion." Underwood is selecting someone in each city on her tour to sing a portion of the song with her on stage.

Singing is just a part of the contest. Each applicant has to write about the person they consider their champion. For Papp, that was easy.

"Immediately, I thought, 'my mom,' and I have to sing for her," said Papp.

Papp's mother, Joan, has battled multiple sclerosis for 30 years.

"She has never let it break her down," said Papp. "She's just such an inspiration to me, so I figured: What better way to do this than for her?"

Papp said she and her mother already had tickets to the concert Saturday night, so when she found out she would sing, she said they went shopping and then prayed.

A few songs before she was to perform with Underwood, Papp said she was whisked under the stage, put into makeup and soon lifted onto the stage to sing.

"I looked to my left and I saw Carrie, and that, was, like the only person I saw in that moment, and I was like, 'OK, we're just singing to each other,' so that was good and it was, really fun," said Papp.

Papp is studying for a business degree, but she said that, after her experience Saturday, she hopes to continue singing, as well.